Subject: nettle-sys: clear out "vendored" feature cruft from build.rs
From: Daniel Kahn Gillmor's avatarDaniel Kahn Gillmor <dkg@fifthhorseman.net>

https://salsa.debian.org/rust-team/debcargo-conf/-/commit/0c71150ad26bb66a8396dcdab055181af232ddc5
https://sources.debian.org/src/rust-nettle-sys/2.0.4-3/debian/patches/disable-vendor.diff/
--- a/Cargo.toml	2019-10-23 13:08:07.000000000 -0400
+++ b/Cargo.toml	2019-10-23 14:08:46.644064014 -0400
@@ -29,12 +29,9 @@
 version = "0.51.1"
 default-features = false
 
-[build-dependencies.nettle-src]
-version = "3.5.1-0"
-optional = true
-
 [build-dependencies.pkg-config]
 version = "0.3"
 
 [features]
 vendored = ["nettle-src"]
+nettle-src = []
diff --git a/build.rs b/build.rs
index 44f7af3..ede4b2f 100644
--- a/build.rs
+++ b/build.rs
@@ -1,7 +1,5 @@
 extern crate bindgen;
 extern crate pkg_config;
-#[cfg(feature = "vendored")]
-extern crate nettle_src;
 
 use std::env;
 use std::fs;
@@ -36,14 +34,6 @@ fn main() {
     println!("cargo:rerun-if-env-changed=NETTLE_STATIC");
     println!("cargo:rerun-if-env-changed={}", NETTLE_PREGENERATED_BINDINGS);
 
-    #[cfg(feature = "vendored")]
-    {
-        let artifacts = nettle_src::Build::new().build();
-        println!("cargo:vendored=1");
-        env::set_var("PKG_CONFIG_PATH",
-                     artifacts.lib_dir().join("pkgconfig"));
-    }
-
     let nettle = pkg_config::probe_library("nettle hogweed").unwrap();
 
     let mode = match env::var_os("NETTLE_STATIC") {
